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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ae7b0d29b6d7b0fbbf7671fada0df7c69cc182f844157c06b30eac195f05e8f' 
  AND token = 'Ut0lDvSNnQ+i5NDA/czYg15CH7NPY69KfZ0jK93Yz6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}